It is straightforward to load GPX files (GPS downloaded tracks / points) into QGIS, then save and manipulate them as shapefiles. However, the recording date (in the comment (cmt) field) of waypoints is in the format YY-MMM-DD HH:MM:SS (e.g. 28-AUG-11 11:57:51) and it would be possible to sort by date only if the format could be parsed to something closer to the ISO 8601 standard (YYYY-MM-DD ...).

1 Answer
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If you're willing to use PostGIS, you can convert the GPX date field to a Postgres timestamp field like so (this works as long as the months are always abbreviated to 3 letters, which I believe is the case):